To install shower plumbing, expose plumbing existing behind the walls and join plastic or copper pipes of appropriate size to the existing pipes for hot and cold water. Install the riser and drain pipes and attach shower fittings. Tightly fit the pipes and fittings at the joints. It is best to install shower plumbing when remodeling the bathroom.
After obtaining necessary building permits, begin the installation by turning off the water supply. Locate the existing water and drain pipes in the bathroom. Normally, they are situated in the bathtub. Expose this plumbing by cutting into the wall or the floor.
Access the pipes for hot and cold water with a hacksaw. Now, cut plastic or copper pipes to a length that equals the distance between the water source and the shower installation area. Using a T-fitting, attach the cut pipes to the existing one. If plastic pipe is attached, apply solvent cement at the joints to ensure a tight fit. If using copper pipes, solder at the joints.
When installing drain pipes, maintain the required distance between the vents and P-trap. To install the riser pipe, attach it to the pipe that supplies water to the shower. Join the drain and riser pipes using pipes cut to the required length. Finally, bring the pipe out through the wall and attach the faucet, shower head and other fixtures to its end using an elbow.